I think most of the data provided on the net is true because
Singapore is a very small place and its not easy to hide things as
big as planes. Further more these planes requires quite a big
ground crew to maintain and service. People talk and more people
means more info may eventually get out. Singapore's military bases
are frequently entered by our own citizens(those serving NS and
contractors), foreigners( construction workers etc). So it is very
hard to hide anything from so many prying eyes. We don't make our
own planes, we buy them from other countries so the actual number
of planes if pretty well known, i mean just take a look at Janes
defence weekly,they have tons of such info from around the
world.
However, Singapore is also known to keep secrets. I am sure we have
some technologies which are not known to the outside world. I don't
mean that we have new planes, what i meant is what is in these
planes. I am quite certain that they are modified to suit our needs
as time progresses such as electronic warfare suite. 
